JP6951260B2 - Fuel injection control device - Google Patents

Fuel injection control device Download PDF

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JP6951260B2
JP6951260B2 JP2018002854A JP2018002854A JP6951260B2 JP 6951260 B2 JP6951260 B2 JP 6951260B2 JP 2018002854 A JP2018002854 A JP 2018002854A JP 2018002854 A JP2018002854 A JP 2018002854A JP 6951260 B2 JP6951260 B2 JP 6951260B2
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fuel injection
time
current
injection valve
energizing current
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淳史 倉内
淳史 倉内
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Honda Motor Co Ltd
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Description

本発明は、内燃機関の燃料噴射弁の開閉を制御する燃料噴射制御装置に関する。 The present invention relates to a fuel injection control device that controls the opening and closing of a fuel injection valve of an internal combustion engine.

従来、内燃機関においては、燃焼効率を向上させる一手段として、燃料噴射を１燃焼サイクル中の燃料噴射期間内に複数回に分けて行う多段噴射の手法が知られている。このような多段噴射の一例として、例えば特許文献１には、ディーゼル機関において燃料加圧室の圧力を昇降させる電磁スピル弁を燃料噴射期間中に開閉することにより多段噴射を行うことが開示されている。この場合、燃料噴射期間中に電磁スピル弁を、一瞬、全開弁状態として燃料加圧室の圧力を十分低下させることで、その瞬間だけ燃料噴射を停止させて多段噴射が行われる。 Conventionally, in an internal combustion engine, as a means for improving combustion efficiency, a multi-stage injection method in which fuel injection is divided into a plurality of times within a fuel injection period in one combustion cycle is known. As an example of such multi-stage injection, for example, Patent Document 1 discloses that multi-stage injection is performed by opening and closing an electromagnetic spill valve that raises and lowers the pressure of a fuel pressurizing chamber in a diesel engine during a fuel injection period. There is. In this case, the electromagnetic spill valve is momentarily fully opened during the fuel injection period to sufficiently reduce the pressure in the fuel pressurizing chamber, so that the fuel injection is stopped only at that moment and multi-stage injection is performed.

この電子制御式燃料噴射システムでは、無通電時に開弁となり通電時に閉弁となる電磁スピル弁が用いられ、燃料噴射期間中に電磁スピル弁を無通電状態として開弁することにより、燃料噴射が一瞬停止される。そして、その後に電磁スピル弁への通電をオンにして当該電磁スピル弁を開弁状態から閉弁状態へ移行させて燃料噴射を再開する際に、当該電磁スピル弁に流れる電流のピーク値又は上昇速度がそれぞれ所定値未満であるか否かが判断される。これにより、上記ピーク値又は上昇速度がそれぞれ所定値以上であったときは、上記閉弁状態への移行の前に全開弁状態が確立されていなかったものとして、上記無通電状態の時間が電磁スピル弁を全開弁状態とするのに適正な時間の範囲外であったものと判断される。 In this electronically controlled fuel injection system, an electromagnetic spill valve that opens when the power is off and closes when the power is on is used, and fuel injection is performed by opening the electromagnetic spill valve in the non-energized state during the fuel injection period. It is stopped for a moment. Then, when the energization of the electromagnetic spill valve is turned on to shift the electromagnetic spill valve from the valve open state to the valve closed state and the fuel injection is restarted, the peak value or increase of the current flowing through the electromagnetic spill valve is increased. It is determined whether or not each speed is less than a predetermined value. As a result, when the peak value or the rising speed is equal to or higher than the predetermined value, it is assumed that the fully opened state has not been established before the transition to the valve closed state, and the time in the non-energized state is electromagnetic. It is judged that the spill valve was out of the proper time range for the valve to be fully opened.

特許文献１に記載された電子制御式燃料噴射システムによれば、燃料噴射期間における電磁スピル弁の上記全開状態への確実な移行を検知しつつ、多段噴射を実行することができる。しかしながら、上記従来の燃料噴射システムは、燃料加圧室に電磁スピル弁が設けられている構成を前提としており、燃料噴射弁を直接制御して多段噴射を行う構成に比べて複雑且つ高価となり得る。また、電磁スピル弁の特性は型式の違いや製造ばらつき等に起因して必ずしも一定ではないことから、電磁スピル弁に流れる電流のピーク値又は上昇速度との比較に用いる上記所定値は、個々の電磁スピル弁の特性に応じた適正な値に調整する必要があり、製造コストの上昇を招き得る。 According to the electronically controlled fuel injection system described in Patent Document 1, multi-stage injection can be executed while detecting the reliable transition of the electromagnetic spill valve to the fully open state during the fuel injection period. However, the above-mentioned conventional fuel injection system is premised on a configuration in which an electromagnetic spill valve is provided in the fuel pressurizing chamber, and can be complicated and expensive as compared with a configuration in which the fuel injection valve is directly controlled to perform multi-stage injection. .. In addition, since the characteristics of the electromagnetic spill valve are not always constant due to differences in models, manufacturing variations, etc., the above-mentioned predetermined values used for comparison with the peak value or rising speed of the current flowing through the electromagnetic spill valve are individual. It is necessary to adjust the value to an appropriate value according to the characteristics of the electromagnetic spill valve, which may lead to an increase in manufacturing cost.

特開２００４−９０５０２号公報Japanese Unexamined Patent Publication No. 2004-90502

上記背景より、燃料噴射弁を直接的に制御して多段噴射を行う内燃機関において、当該多段噴射の際の噴射動作間における燃料噴射弁の全閉状態（すなわち、燃料噴射停止状態）の確立の有無を安価且つ効果的に検知することが求められている。 From the above background, in an internal combustion engine that directly controls a fuel injection valve to perform multi-stage injection, the establishment of a fully closed state (that is, a fuel injection stop state) of the fuel injection valve during the injection operation during the multi-stage injection is established. It is required to detect the presence or absence inexpensively and effectively.

本発明の一の態様は、内燃機関の気筒に設けられた燃料噴射弁により前記気筒への燃料噴射期間に前記気筒へ複数回の燃料噴射を行う多段噴射動作を制御する燃料噴射制御装置であって、前記燃料噴射弁への通電電流を検出する電流検出部と、前記燃料噴射弁に流れる通電電流から前記燃料噴射弁の開閉動作の状態を判定する状態判断部と、を備え、前記状態判断部は、前記燃料噴射期間における前記複数回の燃料噴射のうち、１回目の前記燃料噴射である先頭燃料噴射と、前記先頭燃料噴射の後に行われる燃料噴射である少なくとも１回の後続燃料噴射とにおいて、前記先頭燃料噴射における前記通電電流である第１通電電流と、前記後続燃料噴射おける前記通電電流である第２通電電流と、を検出し、前記第１通電電流の時間変化曲線に対する、前記第２通電電流の時間変化曲線の偏差から、前記後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていたか否かを判断する、よう構成されている。
本発明の他の態様によると、前記状態判断部は、前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１通電電流の増加速度の変化時刻までの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流の増加速度の変化時刻までの時間が、第１所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する。
本発明の他の態様によると、前記状態判断部は、前記第１通電電流の最大値に対し、前記第２通電電流の最大値が第１所定値以上大きいとき、当該第２通電電流に対応する前記後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する。
本発明の他の態様によると、前記状態判断部は、前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１通電電流が第２所定値に達するまでの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流が前記第２所定値に達するまでの時間が第２所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する。
本発明の他の態様によると、前記状態判断部は、時間と電流値とで構成される座標平面において、前記第１通電電流が最大となる直前の所定時間内における当該第１通電電流の近似直線と電流値０の軸とが交差する第１交点と、前記第２通電電流が最大となる直前の所定時間内における当該第２通電電流の近似直線と電流値０の軸とが交差する第２交点と、を算出し、前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１交点までの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流の前記第２交点までの時間が、第３所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する。 One aspect of the present invention is a fuel injection control device that controls a multi-stage injection operation in which a fuel injection valve provided in a cylinder of an internal combustion engine controls a plurality of fuel injections into the cylinder during a fuel injection period into the cylinder. The state determination unit is provided with a current detection unit for detecting the energization current to the fuel injection valve and a state determination unit for determining the opening / closing operation state of the fuel injection valve from the energization current flowing through the fuel injection valve. The unit includes, among the plurality of fuel injections during the fuel injection period, the first fuel injection, which is the first fuel injection, and at least one subsequent fuel injection, which is the fuel injection performed after the first fuel injection. In, the first energization current, which is the energization current in the leading fuel injection, and the second energization current, which is the energization current in the subsequent fuel injection, are detected, and the first energization current with respect to the time change curve is described. From the deviation of the time change curve of the second energizing current, it is determined whether or not the fuel injection valve is in the fully closed state immediately before the subsequent fuel injection.
According to another aspect of the present invention, the state determination unit performs the subsequent fuel injection with respect to the time from the start of energization of the fuel injection valve in the leading fuel injection to the time of change in the rate of increase of the first energizing current. When the time from the start of energization of the fuel injection valve to the change time of the corresponding increase rate of the second energization current is shorter than the first predetermined time, the fuel injection valve is fully closed immediately before the subsequent fuel injection. It is judged that the valve was not closed.
According to another aspect of the present invention, when the maximum value of the second energizing current is larger than the first predetermined value with respect to the maximum value of the first energizing current, the state determination unit corresponds to the second energizing current. It is determined that the fuel injection valve was not in the fully closed state immediately before the subsequent fuel injection.
According to another aspect of the present invention, the state determination unit determines the subsequent fuel with respect to the time from the start of energization of the fuel injection valve in the leading fuel injection until the first energizing current reaches the second predetermined value. When the time from the start of energization of the fuel injection valve in the injection until the corresponding second energization current reaches the second predetermined value is shorter than the second predetermined time, the fuel injection valve is immediately before the subsequent fuel injection. Is judged to have not been fully closed.
According to another aspect of the present invention, the state determination unit approximates the first energizing current within a predetermined time immediately before the first energizing current becomes maximum in the coordinate plane composed of the time and the current value. The first intersection where the straight line and the axis of the current value 0 intersect, and the approximate straight line of the second energizing current and the axis of the current value 0 intersect within a predetermined time immediately before the second energizing current becomes maximum. The two intersections are calculated, and the time from the start of energization of the fuel injection valve to the first intersection in the leading fuel injection corresponds to the corresponding time from the start of energization of the fuel injection valve in the subsequent fuel injection. When the time of the second energizing current to the second intersection is shorter than the third predetermined time, it is determined that the fuel injection valve is not in the fully closed state immediately before the subsequent fuel injection.

本発明の一実施形態に係る燃料噴射制御装置の構成を示す図である。It is a figure which shows the structure of the fuel injection control device which concerns on one Embodiment of this invention. 正常動作の場合の、ＩＮＪ電圧、ＩＮＪ電流、及び燃料噴射弁の時間変化の例を示す図である。It is a figure which shows the example of the time change of INJ voltage, INJ current, and fuel injection valve in the case of normal operation. 異常動作の場合の、ＩＮＪ電圧、ＩＮＪ電流、及び燃料噴射弁の時間変化の例を示す図である。It is a figure which shows the example of the time change of the INJ voltage, the INJ current, and the fuel injection valve in the case of an abnormal operation. 図１に示す燃料噴射制御装置の処理の手順を示すフロー図である。It is a flow chart which shows the procedure of the process of the fuel injection control device shown in FIG.

以下、図面を参照して本発明の実施形態について説明する。
図１は、本発明の一実施形態に係る燃料噴射制御装置の構成を示す図である。
この燃料噴射制御装置１００は、例えば内燃機関１０２を用いる車両（不図示）に搭載され、当該内燃機関１０２の気筒（不図示）に設けられた燃料噴射弁１０４を制御して多段噴射動作を制御すると共に、多段噴射動作における燃料噴射弁１０４の開閉動作の状態を判定する。燃料噴射制御装置１００は、昇圧回路１１０と、駆動電圧出力部１１２と、電流検出部１１４と、通信インタフェース（Ｉ／Ｆ）部１１６と、記憶部１１８と、処理装置１２０と、を備える。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a fuel injection control device according to an embodiment of the present invention.
The fuel injection control device 100 is mounted on, for example, a vehicle (not shown) using an internal combustion engine 102, and controls a fuel injection valve 104 provided in a cylinder (not shown) of the internal combustion engine 102 to control a multi-stage injection operation. At the same time, the state of the opening / closing operation of the fuel injection valve 104 in the multi-stage injection operation is determined. The fuel injection control device 100 includes a booster circuit 110, a drive voltage output unit 112, a current detection unit 114, a communication interface (I / F) unit 116, a storage unit 118, and a processing device 120.

昇圧回路１１０は、外部から供給されるバッテリ電圧ＶＢを昇圧して、昇圧電圧ＶＵを駆動電圧出力部１１２に供給する。駆動電圧出力部１１２は、例えば、電磁弁である燃料噴射弁１０４を駆動するための電圧を出力する駆動回路である。駆動電圧出力部１１２は、バッテリ電圧ＶＢ及び昇圧電圧ＶＵにより動作し、処理装置１２０からの指令に基づいて燃料噴射弁１０４へ駆動電圧を出力する。 The booster circuit 110 boosts the battery voltage V B supplied from the outside and supplies the boost voltage V U to the drive voltage output unit 112. The drive voltage output unit 112 is, for example, a drive circuit that outputs a voltage for driving the fuel injection valve 104, which is a solenoid valve. The drive voltage output unit 112 operates by the battery voltage V B and the boost voltage V U, and outputs the drive voltage to the fuel injection valve 104 based on the command from the processing device 120.

電流検出部１１４は、燃料噴射弁１０４に流れる電流の大きさを示す信号を処理装置１２０に出力する。電流検出部１１４は、例えば分圧抵抗により燃料噴射弁１０４に流れる電流に比例した電圧を出力する電流検出回路である。通信Ｉ／Ｆ部１１６は、燃料噴射制御装置１００が、車両内ネットワークを構成するバスを介して他の制御装置と通信するための通信インタフェースである。通信Ｉ／Ｆ部１１６は、例えば、車両内ネットワークを構成するＣＡＮ（Controller Area Network）バスに接続された、ＣＡＮ通信規格に準拠する送受信器で構成される。 The current detection unit 114 outputs a signal indicating the magnitude of the current flowing through the fuel injection valve 104 to the processing device 120. The current detection unit 114 is a current detection circuit that outputs a voltage proportional to the current flowing through the fuel injection valve 104 due to, for example, a voltage dividing resistor. The communication I / F unit 116 is a communication interface for the fuel injection control device 100 to communicate with other control devices via a bus constituting an in-vehicle network. The communication I / F unit 116 is composed of, for example, a transmitter / receiver compliant with the CAN communication standard connected to a CAN (Controller Area Network) bus that constitutes an in-vehicle network.

記憶部１１８は、揮発性及び不揮発性の半導体メモリ等で構成され、処理装置１２０における動作に必要なデータ及び又はソフトウェアプログラムを記憶する。 The storage unit 118 is composed of volatile and non-volatile semiconductor memories and the like, and stores data and / or software programs necessary for operation in the processing device 120.

処理装置１２０は、内燃機関１０２に設けられたクランク角センサ１０６からの信号及び電流検出部１１４からの信号等に基づいて、燃料噴射弁１０４を駆動する駆動電圧出力部１１２の出力電圧を制御して、燃料噴射弁１０４の動作を制御する。また、処理装置１２０は、電流検出部１１４により検知される燃料噴射弁１０４に流れる電流から、燃料噴射弁１０４の動作の状態を判断する。 The processing device 120 controls the output voltage of the drive voltage output unit 112 that drives the fuel injection valve 104 based on a signal from the crank angle sensor 106 provided in the internal combustion engine 102, a signal from the current detection unit 114, and the like. The operation of the fuel injection valve 104 is controlled. Further, the processing device 120 determines the operating state of the fuel injection valve 104 from the current flowing through the fuel injection valve 104 detected by the current detection unit 114.

処理装置１２０は、例えば、ＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）等のプロセッサーを備えるコンピューターである。処理装置１２０は、プログラムが書き込まれたＲＯＭ（Ｒｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）、データの一時記憶のためのＲＡＭ（Ｒａｎｄｏｍ Ａｃｃｅｓｓ Ｍｅｍｏｒｙ）等を有する構成であってもよい。そして、処理装置１２０は、機能要素（又は機能ユニット）として、通電制御部１２２と、状態判断部１２４とを有する。判断状態部は、機能要素である電流波形検出部１３０と波形比較部１３２とで構成される。また、波形比較部１３２は、機能要素として、速度変化点比較部１４０と、最大電流比較部１４２と、到達時間比較部１４４と、外挿点比較部１４６と、を有する。 The processing device 120 is, for example, a computer including a processor such as a CPU (Central Processing Unit). The processing device 120 may have a configuration including a ROM (Read Only Memory) in which a program is written, a RAM (Random Access Memory) for temporarily storing data, and the like. The processing device 120 has an energization control unit 122 and a state determination unit 124 as functional elements (or functional units). The determination state unit is composed of a current waveform detection unit 130 and a waveform comparison unit 132, which are functional elements. Further, the waveform comparison unit 132 has a velocity change point comparison unit 140, a maximum current comparison unit 142, an arrival time comparison unit 144, and an extrapolation point comparison unit 146 as functional elements.

処理装置１２０が備えるこれらの機能要素は、例えば、コンピューターである処理装置１２０がプログラムを実行することにより実現される。なお、上記コンピューター・プログラムは、コンピューター読み取り可能な任意の記憶媒体に記憶させておくことができる。これに代えて、処理装置１２０が備える上記機能要素の全部又は一部を、それぞれ一つ以上の電子回路部品を含むハードウェアにより構成することもできる。 These functional elements included in the processing device 120 are realized, for example, by the processing device 120, which is a computer, executing a program. The computer program can be stored in any computer-readable storage medium. Alternatively, all or part of the functional elements included in the processing apparatus 120 may be configured by hardware including one or more electronic circuit components.

通電制御部１２２は、クランク角センサ１０６及びアクセルセンサ１０８からの信号に基づき、駆動電圧出力部１１２の出力電圧、すなわち燃料噴射弁１０４へ通電する駆動電圧を制御して、内燃機関１０２の１燃焼サイクルにおける燃料噴射期間中に燃料噴射弁１０４を複数回開閉して複数回の燃料噴射を行う多段噴射を実行する。具体的には、通電制御部１２２は、クランク角センサ１０６からの信号に基づいて燃料噴射弁１０４の開閉タイミングを制御すると共に、１燃焼サイクル中の多段噴射における総燃料噴射量がアクセルセンサ１０８からの信号に応じた目標燃料噴射量となるように、燃料噴射弁１０４の開弁時間を制御する。 The energization control unit 122 controls the output voltage of the drive voltage output unit 112, that is, the drive voltage for energizing the fuel injection valve 104, based on the signals from the crank angle sensor 106 and the accelerator sensor 108, and one combustion of the internal combustion engine 102. During the fuel injection period in the cycle, the fuel injection valve 104 is opened and closed a plurality of times to execute multi-stage injection in which the fuel injection is performed a plurality of times. Specifically, the energization control unit 122 controls the opening / closing timing of the fuel injection valve 104 based on the signal from the crank angle sensor 106, and the total fuel injection amount in the multi-stage injection during one combustion cycle is from the accelerator sensor 108. The valve opening time of the fuel injection valve 104 is controlled so that the target fuel injection amount is obtained according to the signal of.

状態判断部１２４は、燃料噴射弁１０４に流れる通電電流（以下、ＩＮＪ電流（インジェクション電流）ともいう）から燃料噴射弁１０４の開閉動作の状態を判定する。具体的には、状態判断部１２４は、電流波形検出部１３０により、電流検出部１１４からの信号に基づき、１燃焼サイクルにおける燃料噴射期間中において燃料噴射弁１０４に流れるＩＮＪ電流を所定の時間間隔で検知して記憶する。これにより、燃料噴射期間中におけるＩＮＪ電流の時間変化曲線が記憶される。 The state determination unit 124 determines the state of the opening / closing operation of the fuel injection valve 104 from the energizing current (hereinafter, also referred to as INJ current (injection current)) flowing through the fuel injection valve 104. Specifically, the state determination unit 124 uses the current waveform detection unit 130 to transmit the INJ current flowing through the fuel injection valve 104 during the fuel injection period in one combustion cycle at predetermined time intervals based on the signal from the current detection unit 114. Detect and memorize with. As a result, the time change curve of the INJ current during the fuel injection period is stored.

また、状態判断部１２４は、波形比較部１３２により、１燃焼サイクル中の燃料噴射期間における複数回の燃料噴射のうち、１回目の燃料噴射である先頭燃料噴射（いわゆる、パイロット噴射）と、先頭燃料噴射の後に行われる燃料噴射である少なくとも１回の後続燃料噴射とにおいて、先頭燃料噴射におけるＩＮＪ電流である第１通電電流と、後続燃料噴射おけるＩＮＪ電流である第２通電電流と、を検出する。そして、状態判断部１２４は、第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差を算出し、当該算出した偏差から、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていたか否かを判断する。 Further, the state determination unit 124 uses the waveform comparison unit 132 to perform the first fuel injection (so-called pilot injection) and the head of the plurality of fuel injections in the fuel injection period during one combustion cycle. In at least one subsequent fuel injection, which is a fuel injection performed after the fuel injection, the first energization current, which is the INJ current in the leading fuel injection, and the second energization current, which is the INJ current in the subsequent fuel injection, are detected. do. Then, the state determination unit 124 calculates the deviation of the time change curve of the second energization current with respect to the time change curve of the first energization current, and from the calculated deviation, the fuel injection valve 104 is fully closed immediately before the subsequent fuel injection. Judge whether or not it was in a valve state.

図２は、後続燃料噴射の直前において燃料噴射弁１０４が全閉状態になる正常動作の場合の、先頭燃料噴射とその後続燃料噴射におけるＩＮＪ電圧、ＩＮＪ電流、及び燃料噴射弁１０４の時間変化の例を示す図である。図２の上段はＩＮＪ電圧、中断はＩＮＪ電流、下段は燃料噴射弁１０４の状態を、それぞれ示している。ＩＮＪ電圧曲線２００は、駆動電圧出力部１１２から燃料噴射弁１０４に印加された駆動電圧（以下、ＩＮＪ電圧（インジェクション電圧）ともいう）の時間変化を示す。ＩＮＪ電流曲線２０２は、印加されたＩＮＪ電圧に起因して燃料噴射弁１０４に流れるＩＮＪ電流の時間変化を示す。また、弁体位置曲線２０４は、燃料噴射弁１０４の弁体（不図示）の位置の時間変化を示す。 FIG. 2 shows the time changes of the INJ voltage, INJ current, and fuel injection valve 104 in the leading fuel injection and the subsequent fuel injection in the case of normal operation in which the fuel injection valve 104 is fully closed immediately before the subsequent fuel injection. It is a figure which shows an example. The upper part of FIG. 2 shows the INJ voltage, the interruption shows the INJ current, and the lower part shows the state of the fuel injection valve 104. The INJ voltage curve 200 shows the time change of the drive voltage (hereinafter, also referred to as INJ voltage (injection voltage)) applied to the fuel injection valve 104 from the drive voltage output unit 112. The INJ current curve 202 shows the time change of the INJ current flowing through the fuel injection valve 104 due to the applied INJ voltage. Further, the valve body position curve 204 shows the time change of the position of the valve body (not shown) of the fuel injection valve 104.

図２に示す例では、時刻ｔ１から時刻ｔ４において先頭燃料噴射のためのＩＮＪ電圧が印加され、時刻ｔ５からｔ８において後続燃料噴射のためのＩＮＪ電圧が印加されて、２段階の多段噴射が行われている。時刻ｔ１からｔ４までの、ＩＮＪ電圧に応答して流れるＩＮＪ電流が第１通電電流に対応し、ＩＮＪ電流曲線２０２のうち時刻ｔ１からｔ４までの部分が第１通電電流の時間変化曲線に対応する。また、時刻ｔ５からｔ８までのＩＮＪ電流が第２通電電流に対応し、ＩＮＪ電流曲線２０２のうち時刻ｔ５からｔ８までの部分が第２通電電流の時間変化曲線に対応する。 In the example shown in FIG. 2, the INJ voltage for the leading fuel injection is applied from time t1 to time t4, the INJ voltage for subsequent fuel injection is applied from time t5 to t8, and two-stage multi-stage injection is performed. It has been. The INJ current flowing in response to the INJ voltage from time t1 to t4 corresponds to the first energizing current, and the portion of the INJ current curve 202 from time t1 to t4 corresponds to the time change curve of the first energizing current. .. Further, the INJ current from time t5 to t8 corresponds to the second energizing current, and the portion of the INJ current curve 202 from time t5 to t8 corresponds to the time change curve of the second energizing current.

図２において、時刻ｔ１に、先頭燃料噴射を開始すべくＩＮＪ電圧が昇圧電圧ＶＵに設定され、燃料噴射弁１０４への電圧印加が開始される。燃料噴射弁１０４は、時刻ｔ１よりやや遅れて、ＩＮＪ電流が弁体移動に必要な力を発生させる程度にまで増加したときに、全閉状態から全開弁状態への移行動作を開始する。その後、ＩＮＪ電圧は、燃料噴射弁１０４が全閉状態から全開状態へ移行するのに十分な所定の時間だけＶＵに維持された後、時刻ｔ３において、全開弁状態を維持できる程度の電圧ＶＢまで低減される。そして、時刻ｔ３の後、先頭燃料噴射における燃料噴射量を所定量とするために全開弁状態を維持しておくべき所定の時間が経過した時刻ｔ４において、燃料噴射弁１０４への印加電圧は遮断され、ＩＮＪ電圧はゼロまで低下する。これにより、燃料噴射弁１０４は全開状態から全閉状態へ移行し、先頭燃料噴射が終了する。 In Figure 2, at time t1, INJ voltage in order to start the first fuel injection is set to the boosted voltage V U, the voltage applied to the fuel injection valve 104 is started. The fuel injection valve 104 starts the operation of shifting from the fully closed state to the fully open state when the INJ current increases to the extent that a force required for valve body movement is generated slightly later than the time t1. After that, the INJ voltage is maintained at V U for a predetermined time sufficient for the fuel injection valve 104 to shift from the fully closed state to the fully open state, and then at time t3, the voltage V is such that the fully opened state can be maintained. It is reduced to B. Then, after the time t3, the voltage applied to the fuel injection valve 104 is cut off at the time t4 when a predetermined time for maintaining the fully open valve state has elapsed in order to set the fuel injection amount at the head fuel injection to a predetermined amount. Then, the INJ voltage drops to zero. As a result, the fuel injection valve 104 shifts from the fully open state to the fully closed state, and the leading fuel injection ends.

これに対し、燃料噴射弁１０４に流れるＩＮＪ電流は、時刻ｔ１から、電磁弁である燃料噴射弁１０４の閉弁状態におけるインダクタンスＬ１と直流抵抗値とで定まる増加速度ｓ１で、時間と共に上昇する。その後、燃料噴射弁１０４の弁体移動の開始と共に、燃料噴射弁１０４のインダクタンスが開弁状態のインダクタンスＬ２へ変化することにより、ＩＮＪ電流は、その増加速度が時刻ｔ２においてｓ１からｓ２へと増加し、さらに上昇していく。その後、ＩＮＪ電流は、ＩＮＪ電圧が昇圧電圧ＶＵからＶＢへ移行する時刻ｔ３において最大値Ｉｍとなったあと、急減して定常状態に達し、ＩＮＪ電圧の値ＶＢと燃料噴射弁１０４の直流抵抗値とで定まる値Ｉｓとなる。そして、時刻ｔ４においてＩＮＪ電圧がゼロに設定されると、ＩＮＪ電流はゼロとなる。 On the other hand, the INJ current flowing through the fuel injection valve 104 increases with time from time t1 at an increasing speed s1 determined by the inductance L1 and the DC resistance value in the closed state of the fuel injection valve 104, which is a solenoid valve. After that, with the start of valve body movement of the fuel injection valve 104, the inductance of the fuel injection valve 104 changes to the inductance L2 in the valve open state, so that the INJ current increases from s1 to s2 at the time t2. And it will rise further. After that, the INJ current reaches the maximum value Im at the time t3 when the INJ voltage shifts from the boosted voltage V U to V B , then suddenly decreases and reaches a steady state, and the INJ voltage value V B and the fuel injection valve 104 It is a value Is determined by the DC resistance value. Then, when the INJ voltage is set to zero at time t4, the INJ current becomes zero.

時刻ｔ４において燃料噴射弁１０４への先頭燃料噴射のための電圧印加が終了した後、燃料噴射弁１０４が全開状態から全閉状態へ移行するのに必要且つ十分な時間として予め定められた所定時間が経過する時刻ｔ５において、後続燃料噴射を開始すべく、ＩＮＪ電圧が再び昇圧電圧ＶＵに設定される。 A predetermined time required and sufficient for the fuel injection valve 104 to shift from the fully open state to the fully closed state after the voltage application for the leading fuel injection to the fuel injection valve 104 is completed at time t4. At time t5 when the lapse of time, the INJ voltage is set to the boost voltage V U again in order to start the subsequent fuel injection.

燃料噴射弁１０４は、時刻ｔ５よりやや遅れて全閉状態から全開弁状態への移行動作を開始する。その後、ＩＮＪ電圧は、燃料噴射弁１０４が全閉状態から全開状態へ移行するのに十分な所定の時間だけＶＵに維持された後、時刻ｔ７において、全開弁状態を維持できる程度の電圧ＶＢまで低減される。そして、時刻ｔ７の後、後続燃料噴射における燃料噴射量を所定量とするために全開弁状態を維持しておくべき所定の時間が経過した時刻ｔ８において、燃料噴射弁１０４への印加電圧は遮断され、ＩＮＪ電圧はゼロまで低下する。これにより、燃料噴射弁１０４は全開状態から全閉状態へ移行し、後続燃料噴射が終了する。 The fuel injection valve 104 starts the operation of shifting from the fully closed state to the fully opened state slightly later than the time t5. After that, the INJ voltage is maintained at V U for a predetermined time sufficient for the fuel injection valve 104 to shift from the fully closed state to the fully open state, and then at time t7, the voltage V is such that the fully opened state can be maintained. It is reduced to B. Then, after the time t7, the voltage applied to the fuel injection valve 104 is cut off at the time t8 when a predetermined time for maintaining the fully open valve state has elapsed in order to set the fuel injection amount in the subsequent fuel injection to a predetermined amount. Then, the INJ voltage drops to zero. As a result, the fuel injection valve 104 shifts from the fully open state to the fully closed state, and the subsequent fuel injection ends.

これに対し、燃料噴射弁１０４に流れるＩＮＪ電流は、まず、増加速度ｓ１で時間と共に上昇する。そして燃料噴射弁１０４のインダクタンスが開弁状態のインダクタンスＬ２へ変化することにより、ＩＮＪ電流の増加速度は、時刻ｔ６においてｓ１からｓ２へ増加する。その後、ＩＮＪ電流は、ＩＮＪ電圧が昇圧電圧ＶＵからＶＢへ移行する時刻ｔ７において最大値となったあと、定常状態に達し、ＩＮＪ電圧の値ＶＢと燃料噴射弁１０４の直流抵抗値とで定まる値Ｉｓとなる。そして、時刻ｔ８においてＩＮＪ電圧がゼロに設定されると、ＩＮＪ電流はゼロとなる。 On the other hand, the INJ current flowing through the fuel injection valve 104 first increases with time at an increasing speed of s1. Then, as the inductance of the fuel injection valve 104 changes to the inductance L2 in the valve open state, the rate of increase of the INJ current increases from s1 to s2 at time t6. After that, the INJ current reaches the maximum value at the time t7 when the INJ voltage shifts from the boosted voltage V U to V B , then reaches a steady state, and becomes the INJ voltage value V B and the DC resistance value of the fuel injection valve 104. It becomes a value Is determined by. Then, when the INJ voltage is set to zero at time t8, the INJ current becomes zero.

ここで、後続燃料噴射の直前において燃料噴射弁１０４が全閉状態となる正常動作においては、先頭燃料噴射及び後続燃料噴射は、共に燃料噴射弁１０４が全閉である状態から動作を開始する。従って、先頭燃料噴射及び後続燃料噴射の開始時点における燃料噴射弁１０４の状態が同じであることから、先頭燃料噴射における第１通電電流の時間変化曲線と、後続燃料噴射における第２通電電流の時間変化曲線とは、ＩＮＪ電流が定常値Ｉｓとなっている期間の長さを除き、図２に示す如く近似した形となり、互いの間に偏差はほとんどない。すなわち、一般に、後続燃料噴射の直前において燃料噴射弁１０４が全閉状態となる正常動作においては、第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の有意な偏差は認められない。 Here, in the normal operation in which the fuel injection valve 104 is fully closed immediately before the subsequent fuel injection, both the leading fuel injection and the succeeding fuel injection start the operation from the state in which the fuel injection valve 104 is fully closed. Therefore, since the state of the fuel injection valve 104 at the start of the first fuel injection and the subsequent fuel injection is the same, the time change curve of the first energization current in the first fuel injection and the time of the second energization current in the subsequent fuel injection The change curve has an approximate shape as shown in FIG. 2 except for the length of the period during which the INJ current is the steady value Is, and there is almost no deviation between them. That is, in general, in the normal operation in which the fuel injection valve 104 is fully closed immediately before the subsequent fuel injection, no significant deviation of the time change curve of the second energization current with respect to the time change curve of the first energization current is observed. ..

例えば、図２において、後続燃料噴射における時刻ｔ５の燃料噴射弁１０４への電圧印加の開始から時刻ｔ６のＩＮＪ電流の増加速度の変化までの時間は、先頭燃料噴射における時刻ｔ１の燃料噴射弁１０４への電圧印加の開始から時刻ｔ２のＩＮＪ電流の増加速度の変化までの時間とほぼ等しい。また、後続燃料噴射における時刻ｔ７でのＩＮＪ電流の最大値は、先頭燃料噴射における時刻ｔ３でのＩＮＪ電流の最大値Ｉｍにほぼ等しい。 For example, in FIG. 2, the time from the start of voltage application to the fuel injection valve 104 at time t5 in the subsequent fuel injection to the change in the rate of increase of the INJ current at time t6 is the fuel injection valve 104 at time t1 in the leading fuel injection. It is almost equal to the time from the start of applying the voltage to the fuel to the change in the rate of increase of the INJ current at time t2. Further, the maximum value of the INJ current at time t7 in the subsequent fuel injection is substantially equal to the maximum value Im of the INJ current at time t3 in the leading fuel injection.

これに対し、先頭燃料噴射とその直後の後続燃料噴射との間において燃料噴射弁１０４が全閉状態にならない異常動作においては、第２通電電流の時間変化曲線は、第１通電電流の時間変化曲線に対して偏差を生じ得る。 On the other hand, in the abnormal operation in which the fuel injection valve 104 is not fully closed between the first fuel injection and the subsequent fuel injection immediately after that, the time change curve of the second energization current is the time change of the first energization current. Deviations can occur with respect to the curve.

図３は、後続燃料噴射の直前において燃料噴射弁１０４が全閉状態にならない異常動作の場合の、先頭燃料噴射とその後続燃料噴射におけるＩＮＪ電圧、ＩＮＪ電流、及び燃料噴射弁１０４の時間変化の例を示す図である。図２と同様に、図３の上段はＩＮＪ電圧、中断はＩＮＪ電流、下段は燃料噴射弁１０４の状態を、それぞれ示している。ＩＮＪ電圧曲線３００は、ＩＮＪ電圧の時間変化を示しており、図２に示すＩＮＪ電圧曲線２００と同一である。ＩＮＪ電流曲線３０２は、印加されたＩＮＪ電圧に起因して燃料噴射弁１０４に流れるＩＮＪ電流の時間変化を示す。また、弁体位置曲線３０４は、燃料噴射弁１０４の弁体位置の時間変化を示している。 FIG. 3 shows the time change of the INJ voltage, INJ current, and fuel injection valve 104 in the leading fuel injection and the subsequent fuel injection in the case of an abnormal operation in which the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection. It is a figure which shows an example. Similar to FIG. 2, the upper part of FIG. 3 shows the INJ voltage, the interruption shows the INJ current, and the lower part shows the state of the fuel injection valve 104. The INJ voltage curve 300 shows the time change of the INJ voltage, and is the same as the INJ voltage curve 200 shown in FIG. The INJ current curve 302 shows the time change of the INJ current flowing through the fuel injection valve 104 due to the applied INJ voltage. Further, the valve body position curve 304 shows the time change of the valve body position of the fuel injection valve 104.

図３の場合、後続燃料噴射の直前において燃料噴射弁１０４が全閉状態になっていない。このため、時刻ｔ５からｔ８までの後続燃料噴射におけるＩＮＪ電流曲線３０２の部分、すなわち第２通電電流の時間変化曲線は、図２の場合と異なり、時刻ｔ１からｔ５までの先頭燃料噴射におけるＩＮＪ電流曲線３０２の部分、すなわち第１通電電流の時間変化曲線に対して近似形とはならず、偏差を生じている。この偏差は、後続燃料噴射の直前において燃料噴射弁１０４のインダクタンスが閉弁状態のインダクタンスＬ１となっていないこと、あるいは、弁体が閉弁位置に向かって移動途中であって上記インダクタンスがＬ１へ向かう変化の途中であること、等に起因する。 In the case of FIG. 3, the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection. Therefore, the portion of the INJ current curve 302 in the subsequent fuel injection from time t5 to t8, that is, the time change curve of the second energizing current is different from the case of FIG. 2, and the INJ current in the leading fuel injection from time t1 to t5. The portion of the curve 302, that is, the time change curve of the first energizing current is not approximated, and a deviation is generated. This deviation is due to the fact that the inductance of the fuel injection valve 104 is not the inductance L1 in the closed state immediately before the subsequent fuel injection, or that the valve body is moving toward the valve closed position and the above inductance goes to L1. This is due to the fact that it is in the middle of a change.

ここで、一の燃焼サイクルの最初の燃料噴射である先頭燃料噴射の直前においては、一般に、燃料噴射弁１０４は全閉状態となっている。先頭燃料噴射の開始時期は、その直前の燃焼サイクルの最後の後続燃料噴射の終了の後、燃料噴射弁１０４が全閉状態に到達するのに十分な時間を経た時刻となっているからである。 Here, immediately before the first fuel injection, which is the first fuel injection in one combustion cycle, the fuel injection valve 104 is generally in a fully closed state. This is because the start time of the first fuel injection is a time sufficient for the fuel injection valve 104 to reach the fully closed state after the end of the last subsequent fuel injection of the combustion cycle immediately before that. ..

本実施形態の燃料噴射制御装置１００は、その開始時点において燃料噴射弁１０４が全閉状態となっていると考えられる先頭燃料噴射における第１通電電流の時間変化曲線に対する、第２通電電流の時間変化曲線の偏差の有無を検知することにより、後続燃料噴射の直前における燃料噴射弁１０４の全閉状態の有無を判断する。 In the fuel injection control device 100 of the present embodiment, the time of the second energizing current with respect to the time change curve of the first energizing current in the leading fuel injection in which the fuel injection valve 104 is considered to be in the fully closed state at the start time thereof. By detecting the presence or absence of deviation of the change curve, it is determined whether or not the fuel injection valve 104 is in the fully closed state immediately before the subsequent fuel injection.

具体的には、燃料噴射制御装置１００は、状態判断部１２４により、第１通電電流の時間変化曲線と第２通電電流の時間変化曲線とにおける、以下に示す４つのパラメータのいずれかを比較することで、第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検知して、後続燃料噴射の直前における燃料噴射弁１０４の全閉状態の有無を判断する。なお、いずれのパラメータを用いて上記偏差を検知するかは、例えば、燃料噴射制御装置１００の製造時において予め記憶部１１８に記憶された比較モード指示値により決定されるものとすることができる。例えば、比較モード指示値が１、２、３、又は４に設定されている場合には、状態判断部１２４は、それぞれ、以下に示す第１、第２、第３、又は第４のパラメータを用いて、上記偏差を検知するものとすることができる。 Specifically, the fuel injection control device 100 compares any of the four parameters shown below in the time change curve of the first energization current and the time change curve of the second energization current by the state determination unit 124. As a result, the presence or absence of deviation of the time change curve of the second energization current with respect to the time change curve of the first energization current is detected, and the presence or absence of the fully closed state of the fuel injection valve 104 immediately before the subsequent fuel injection is determined. Which parameter is used to detect the deviation can be determined, for example, by the comparison mode indicated value stored in the storage unit 118 in advance at the time of manufacturing the fuel injection control device 100. For example, when the comparison mode indicated value is set to 1, 2, 3, or 4, the state determination unit 124 sets the first, second, third, or fourth parameters shown below, respectively. It can be used to detect the deviation.

なお、先頭燃料噴射の開始時点において燃料噴射弁１０４が全閉状態となっていない場合、上記偏差から燃料噴射弁１０４の全閉状態の有無の判断を行うことは困難となる。ただし、１燃焼サイクルの燃料噴射期間の開始時期に相当する先頭燃料噴射の開始時点において燃料噴射弁１０４が全閉状態となっていない状態は、そもそも内燃機関１０２が故障している状態であり、そのような故障状態は、従来技術に従って容易に検知することができるので、燃料噴射制御装置１００における上記全閉状態の有無の判断の対象から容易に除外され得る。 If the fuel injection valve 104 is not in the fully closed state at the start of the leading fuel injection, it is difficult to determine whether or not the fuel injection valve 104 is in the fully closed state from the above deviation. However, the state in which the fuel injection valve 104 is not fully closed at the start time of the leading fuel injection corresponding to the start time of the fuel injection period of one combustion cycle is a state in which the internal combustion engine 102 is out of order in the first place. Since such a failure state can be easily detected according to the prior art, it can be easily excluded from the target of the determination of the presence or absence of the fully closed state in the fuel injection control device 100.

＜第１のパラメータ＞
第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検知するための第１のパラメータは、燃料噴射弁１０４への電圧印加の開始時刻（ｔ１、ｔ５）から、ＩＮＪ電流の増加速度がｓ１からｓ２へ移行する時刻（ｔ２、ｔ９）までの時間Δｔ１である。図３には、第１通電電流におけるΔｔ１の値（即ち、ｔ１からｔ２までの時間）をΔｔ１−１で示し、第２通電電流におけるΔｔ１の値（即ち、ｔ５からｔ９までの時間）をΔｔ１−２で示している。 <First parameter>
The first parameter for detecting the presence or absence of deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current is from the start time (t1, t5) of voltage application to the fuel injection valve 104. The time Δt 1 until the time (t2, t9) when the rate of increase of the INJ current shifts from s1 to s2. In FIG. 3, the value of Δt 1 in the first energizing current (that is, the time from t1 to t2) is shown by Δt 1-1 , and the value of Δt 1 in the second energizing current (that is, the time from t5 to t9) is shown. ) Is indicated by Δt 1-2.

後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていない図３のケースでは、燃料噴射弁１０４への電圧印加が開始されてＩＮＪ電流が増加を開始する時刻ｔ５における燃料噴射弁１０４のインダクタンスは、閉弁状態のインダクタンスＬ１に比べて開弁状態のインダクタンスＬ２により近い値となっている。その結果、第２通電電流の時間変化曲線において、時刻ｔ５の後、燃料噴射弁１０４のインダクタンスが開弁状態のインダクタンスＬ２に達してＩＮＪ電流の増加速度がｓ２へ向かって移行する時刻ｔ９までの時間Δｔ１−２は、先頭燃料噴射の直前に燃料噴射弁１０４が全閉状態となっている第１通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−１よりも小さくなる。 In the case of FIG. 3 in which the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection, the fuel injection valve at the time t5 when the voltage application to the fuel injection valve 104 is started and the INJ current starts to increase. The inductance of 104 has a value closer to the inductance L2 in the valve open state than the inductance L1 in the valve closed state. As a result, in the time change curve of the second energizing current, after the time t5, until the time t9 when the inductance of the fuel injection valve 104 reaches the inductance L2 in the valve open state and the rate of increase of the INJ current shifts toward s2. The time Δt 1-2 is smaller than the value Δt 1-1 of Δt 1 in the time change curve of the first energizing current in which the fuel injection valve 104 is in the fully closed state immediately before the head fuel injection.

従って、燃料噴射制御装置１００の状態判断部１２４が備える波形比較部１３２の速度変化点比較部１４０は、電流波形検出部１３０が記憶した、燃焼サイクルの燃料噴射期間中におけるＩＮＪ電流の時間変化曲線に基づき、第２通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−２と、第１通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−１とを比較し、Δｔ１−２がΔｔ１−１に対して所定値Δｔｔｈ１以上小さいか否かを判断する。そして、状態判断部１２４は、速度変化点比較部１４０における上記判断の結果に基づき、Δｔ１−２がΔｔ１−１に対して所定値Δｔｔｈ１以上小さいときは、その第２通電電流に係る後続燃料噴射の直前において燃料噴射弁１０４は全閉状態ではなかったものと判断する。 Therefore, the speed change point comparison unit 140 of the waveform comparison unit 132 included in the state determination unit 124 of the fuel injection control device 100 is a time change curve of the INJ current during the fuel injection period of the combustion cycle stored by the current waveform detection unit 130. Based on the above, the value Δt 1-2 of Δt 1 in the time change curve of the second energizing current is compared with the value Δt 1-1 of Δt 1 in the time change curve of the first energizing current , and Δt 1-2 is Δt. It is determined whether or not the predetermined value Δt th1 or more is smaller than 1-1. Then, based on the result of the above determination in the speed change point comparison unit 140, the state determination unit 124 relates to the second energization current when Δt 1-2 is smaller than the predetermined value Δt th1 with respect to Δt 1-1. It is determined that the fuel injection valve 104 was not in the fully closed state immediately before the subsequent fuel injection.

すなわち、状態判断部１２４は、先頭燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ１）から第１通電電流の増加速度の変化時刻（ｔ２）までの時間（Δｔ１−１）に対し、後続燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ５）から、対応する前記第２通電電流の増加速度の変化時刻（ｔ９）までの時間（Δｔ１−２）が、第１所定時間（Δｔｔｈ１）以上短いとき、当該後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていなかったものと判断する。 That is, the state determination unit 124 refers to the time (Δt 1-1 ) from the start of energization of the fuel injection valve 104 (time t1) to the change time (t2) of the increase rate of the first energization current in the leading fuel injection. The time (Δt 1-2 ) from the start of energization of the fuel injection valve 104 (time t5) in the subsequent fuel injection to the change time (t9) of the corresponding increase rate of the second energization current is the first predetermined time (time t1-2). When it is shorter than Δth1 ), it is determined that the fuel injection valve 104 is not in the fully closed state immediately before the subsequent fuel injection.

＜第２のパラメータ＞
第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検知するための第２のパラメータは、ＩＮＪ電流の最大値Ｉｍａｘである。図３には、第１通電電流におけるＩｍａｘの値をＩｍａｘ−１で示し、第２通電電流におけるＩｍａｘの値をＩｍａｘ−２で示している。 <Second parameter>
The second parameter for detecting the presence or absence of deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current is the maximum value I max of the INJ current. In FIG. 3, the value of I max in the first energizing current shown in I max-1, represents the value of I max in the second energizing current at I max-2.

上述したように、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていない場合、第２通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−２は、第１通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−１よりも小さくなる。したがって、先頭燃料噴射と後続燃料噴射とにおいてＩＮＪ電圧を昇圧電圧ＶＵに保持する時間が同じであれば、ＩＮＪ電流がｓ１より大きな増加速度ｓ２で増加する期間Δｔ１０は、第１通電電流の時間変化曲線と比較して、第２通電電流の時間変化曲線において長くなる。その結果、第２通電電流におけるＩｍａｘの値をＩｍａｘ−２は、第１通電電流におけるＩｍａｘの値Ｉｍａｘ−１よりも大きくなる。なお、図３には、第１通電電流におけるΔｔ１０の値をΔｔ１０−１で示し、第２通電電流におけるΔｔ１０の値をΔｔ１０−２で示している。 As described above, when the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection, the value Δt 1-2 of Δt 1 in the time change curve of the second energizing current is the first energizing current. It is smaller than the value of Δt 1 in the time change curve, Δt 1-1. Therefore, if the time for holding the INJ voltage at the boosted voltage V U is the same for the first fuel injection and the subsequent fuel injection, the period Δt 10 in which the INJ current increases at an increase rate s2 larger than s1 is the first energization current. Compared with the time change curve, it becomes longer in the time change curve of the second energizing current. As a result, I max-2 the value of I max is in the second energizing current, is larger than the value I max-1 of I max in the first energizing current. Incidentally, in FIG. 3, the value of Delta] t 10 in the first energizing current shown in Delta] t 10-1, represents the value of Delta] t 10 in the second energizing current at Delta] t 10-2.

従って、燃料噴射制御装置１００の状態判断部１２４が備える波形比較部１３２の最大電流比較部１４２は、電流波形検出部１３０が記憶した、燃焼サイクルの燃料噴射期間中におけるＩＮＪ電流の時間変化曲線に基づき、第２通電電流の時間変化曲線におけるＩＮＪ電流の最大値Ｉｍａｘの値Ｉｍａｘ−２と、第１通電電流の時間変化曲線におけるＩＮＪ電流の最大値Ｉｍａｘの値Ｉｍａｘ−１とを比較し、Ｉｍａｘ−２がＩｍａｘ−１に対し所定値ΔＩｔｈ以上大きいか否かを判断する。そして、状態判断部１２４は、最大電流比較部１４２における上記判断の結果に基づき、Ｉｍａｘ−２がＩｍａｘ−１に対して所定値ΔＩｔｈ以上大きいときは、その第２通電電流に係る後続燃料噴射の直前において燃料噴射弁１０４は全閉状態ではなかったものと判断する。 Therefore, the maximum current comparison unit 142 of the waveform comparison unit 132 included in the state determination unit 124 of the fuel injection control device 100 uses the time change curve of the INJ current during the fuel injection period of the combustion cycle stored by the current waveform detection unit 130. based, the value I max-2 of the maximum value I max of the current INJ in the time variation curve of the second energizing current, with the value I max-1 of the maximum value I max of the current INJ in the time variation curve of the first energizing current comparison, I max-2 determines whether to I max-1 greater than a predetermined value [Delta] I th. Then, based on the result of the above determination in the maximum current comparison unit 142, the state determination unit 124 determines that when I max-2 is larger than the predetermined value ΔIth with respect to I max-1 , the subsequent current is related to the second energization current. It is determined that the fuel injection valve 104 was not in the fully closed state immediately before the fuel injection.

すなわち、状態判断部１２４は、第１通電電流の最大値Ｉｍａｘ−１に対し、第２通電電流の最大値Ｉｍａｘ−２が第１所定値ΔＩｔｈ以上大きいとき、第２通電電流に対応する後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態になっていなかったものと判断する。 That is, when the maximum value I max-2 of the second energizing current is larger than the first predetermined value ΔIth with respect to the maximum value I max-1 of the first energizing current, the state determination unit 124 corresponds to the second energizing current. It is determined that the fuel injection valve 104 was not in the fully closed state immediately before the subsequent fuel injection.

＜第３のパラメータ＞
第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検知するための第３のパラメータは、燃料噴射弁１０４への電圧印加が開始される時刻（ｔ１、ｔ５）から、ＩＮＪ電流が所定値Ｉｐに達するまでの時間Δｔ２である。図３には、第１通電電流におけるΔｔ２の値をΔｔ２−１で示し、第２通電電流におけるΔｔ２の値をΔｔ２−２で示している。 <Third parameter>
The third parameter for detecting the presence or absence of deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current is the time (t1, t5) at which the voltage application to the fuel injection valve 104 is started. From, the time Δt 2 until the INJ current reaches the predetermined value Ip. In FIG. 3, the value of Delta] t 2 in the first energizing current shown in Delta] t 2-1, which indicates the value of Delta] t 2 in the second energizing current at Delta] t 2-2.

上述したように、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていない場合、第２通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−２は、第１通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−１よりも小さくなる。すなわち、第１通電電流の時間変化曲線と比較し、第２通電電流の時間変化曲線においては、燃料噴射弁１０４への電圧印加が開始されたあと、いち早くｓ１より大きな増加速度ｓ２でＩＮＪ電流が上昇を開始する。 As described above, when the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection, the value Δt 1-2 of Δt 1 in the time change curve of the second energizing current is the first energizing current. It is smaller than the value of Δt 1 in the time change curve, Δt 1-1. That is, in comparison with the time change curve of the first energizing current, in the time change curve of the second energizing current, the INJ current is quickly increased at an increase rate s2 larger than s1 after the voltage application to the fuel injection valve 104 is started. Start climbing.

その結果、第２通電電流の時間変化曲線において、ＩＮＪ電圧がゼロからＶＵまで立ち上がる時刻ｔ５のあとＩＮＪ電流が増加して所定値Ｉｐに到達するまでの時間Δｔ２−２は、第１通電電流の時間変化曲線における対応する時間Δｔ２−１よりも短くなる。 As a result, in the time change curve of the second energization current, the time Δt 2-2 until the INJ current increases and reaches the predetermined value Ip after the time t5 when the INJ voltage rises from zero to V U is the first energization. It is shorter than the corresponding time Δt 2-1 in the time change curve of the current.

従って、燃料噴射制御装置１００の状態判断部１２４が備える波形比較部１３２の到達時間比較部１４４は、電流波形検出部１３０が記憶した、燃焼サイクルの燃料噴射期間中におけるＩＮＪ電流の時間変化曲線に基づき、第２通電電流の時間変化曲線におけるΔｔ２の値Δｔ２−２と、第１通電電流の時間変化曲線におけるΔｔ２の値Δｔ２−１とを比較し、Δｔ２−２がΔｔ２−１に対して所定値Δｔｔｈ２以上小さいか否かを判断する。そして、状態判断部１２４は、到達時間比較部１４４における上記判断の結果に基づき、Δｔ２−２がΔｔ２−１に対して所定値Δｔｔｈ２以上小さいときは、その第２通電電流に係る後続燃料噴射の直前において燃料噴射弁１０４は全閉状態ではなかったものと判断する。 Therefore, the arrival time comparison unit 144 of the waveform comparison unit 132 included in the state determination unit 124 of the fuel injection control device 100 uses the INJ current time change curve stored in the current waveform detection unit 130 during the fuel injection period of the combustion cycle. Based on this, the value Δt 2-2 of Δt 2 on the time change curve of the second energizing current is compared with the value Δt 2-1 of Δt 2 on the time change curve of the first energizing current , and Δt 2-2 is Δt 2 It is determined whether or not the predetermined value Δth2 or more is smaller than -1. Then, based on the result of the above determination in the arrival time comparison unit 144, the state determination unit 124 indicates that when Δt 2-2 is smaller than the predetermined value Δt th2 with respect to Δt 2-1 , the subsequent energization current is related to the second energization current. It is determined that the fuel injection valve 104 was not in the fully closed state immediately before the fuel injection.

すなわち、状態判断部１２４は、先頭燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ１）から第１通電電流が第２所定値Ｉｐに達するまでの時間（Δｔ２−１）に対し、後続燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ５）から、対応する第２通電電流が第２所定値Ｉｐに達するまでの時間（Δｔ２−２）が第２所定時間（Δｔｔｈ２）以上短いとき、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていなかったものと判断する。 That is, the state determination unit 124 follows the time (Δt 2-1 ) from the start of energization of the fuel injection valve 104 (time t1) in the head fuel injection until the first energization current reaches the second predetermined value Ip. The time (Δt 2-2 ) from the start of energization of the fuel injection valve 104 (time t5) in fuel injection until the corresponding second energization current reaches the second predetermined value Ip is equal to or longer than the second predetermined time (Δt th2). When it is short, it is determined that the fuel injection valve 104 is not in the fully closed state immediately before the subsequent fuel injection.

＜第４のパラメータ＞
第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検知するための第４のパラメータは、時間とＩＮＪ電流値とで構成される座標平面において、燃料噴射弁１０４への電圧印加が開始された時刻（ｔ１、ｔ５）から、ＩＮＪ電流が最大となる直前の所定時間内における当該ＩＮＪ電流の近似直線Ｌが電流値０の軸と交差する点Ｐが与える時刻までの時間Δｔ３である。図３には、第１通電電流における近似直線Ｌ及び点ＰをそれぞれＬ３０及びＰ３０で示し、第２通電電流における近似直線Ｌ及び点ＰをそれぞれＬ３２及びＰ３２で示している。また、第１通電電流におけるΔｔ３をΔｔ３−１で示し、第２通電電流におけるΔｔ３をΔｔ３−２で示している。 <Fourth parameter>
The fourth parameter for detecting the presence or absence of deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current is the fuel injection valve 104 in the coordinate plane composed of time and INJ current value. From the time (t1, t5) when the voltage application to the current is started to the time given by the point P where the approximate straight line L of the INJ current intersects the axis of the current value 0 within a predetermined time immediately before the INJ current becomes maximum. Time Δt 3 . In FIG. 3, the approximate straight line L and the point P in the first energizing current are shown by L30 and P30, respectively, and the approximate straight line L and the point P in the second energizing current are shown by L32 and P32, respectively. Further, a Delta] t 3 of the first energizing current shown in Delta] t 3-1, shows a Delta] t 3 in the second energizing current at Delta] t 3-2.

上述したように、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていない場合、第２通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−２は、第１通電電流の時間変化曲線におけるΔｔ１の値Δｔ１−１よりも小さくなる。すなわち、第１通電電流の時間変化曲線と比較し、第２通電電流の時間変化曲線においては、燃料噴射弁１０４への電圧印加が開始されたあと、いち早くｓ１より大きな増加速度ｓ２でＩＮＪ電流が上昇を開始する。 As described above, when the fuel injection valve 104 is not fully closed immediately before the subsequent fuel injection, the value Δt 1-2 of Δt 1 in the time change curve of the second energizing current is the first energizing current. It is smaller than the value of Δt 1 in the time change curve, Δt 1-1. That is, in comparison with the time change curve of the first energizing current, in the time change curve of the second energizing current, the INJ current is quickly increased at an increase rate s2 larger than s1 after the voltage application to the fuel injection valve 104 is started. Start climbing.

従って、後続燃料噴射において燃料噴射弁１０４への電圧印加が開始される時刻ｔ５から、第２通電電流における近似曲線Ｌ３２が電流ゼロの軸と交わる点Ｐ３２の時刻までの時間Δｔ３−２は、先頭燃料噴射において燃料噴射弁１０４への電圧印加が開始される時刻ｔ１から第１通電電流における近似曲線Ｌ３０が電流ゼロの軸と交わる点Ｐ３０の時刻までの時間Δｔ３−１よりも短くなる。 Therefore, the time Δt 3-2 from the time t5 when the voltage application to the fuel injection valve 104 is started in the subsequent fuel injection to the time of the point P32 where the approximate curve L32 in the second energizing current intersects the axis of zero current is It is shorter than the time Δt 3-1 from the time t1 when the voltage application to the fuel injection valve 104 is started in the head fuel injection to the time of the point P30 where the approximate curve L30 in the first energizing current intersects the axis of zero current.

従って、燃料噴射制御装置１００の状態判断部１２４が備える波形比較部１３２の外挿点比較部１４６は、電流波形検出部１３０が記憶した、燃焼サイクルの燃料噴射期間中におけるＩＮＪ電流の時間変化曲線に基づき、第２通電電流の時間変化曲線におけるΔｔ３の値Δｔ３−２と、第１通電電流の時間変化曲線におけるΔｔ３の値Δｔ３−１とを比較し、Δｔ３−２がΔｔ３−１に対して所定値Δｔｔｈ３以上小さいか否かを判断する。そして、状態判断部１２４は、外挿点比較部１４６における上記判断の結果に基づき、Δｔ３−２がΔｔ３−１に対して所定値Δｔｔｈ３以上小さいときは、その第２通電電流に係る後続燃料噴射の直前において燃料噴射弁１０４は全閉状態ではなかったものと判断する。 Therefore, the external point comparison unit 146 of the waveform comparison unit 132 included in the state determination unit 124 of the fuel injection control device 100 is a time change curve of the INJ current during the fuel injection period of the combustion cycle stored by the current waveform detection unit 130. Based on the above, the value Δt 3-2 of Δt 3 in the time change curve of the second energizing current is compared with the value Δt 3-1 of Δt 3 in the time change curve of the first energizing current , and Δt 3-2 is Δt. It is determined whether or not the predetermined value Δt th3 or more is smaller than 3-1. Then, based on the result of the above determination in the extrapolation point comparison unit 146, the state determination unit 124 relates to the second energizing current when Δt 3-2 is smaller than the predetermined value Δt th3 with respect to Δt 3-1. It is determined that the fuel injection valve 104 was not in the fully closed state immediately before the subsequent fuel injection.

すなわち、状態判断部１２４は、時間と電流値とで構成される座標平面において、第１通電電流が最大となる直前の所定時間内における第１通電電流の近似直線Ｌ３０と電流値０の軸とが交差する第１交点Ｐ３０と、第２通電電流が最大となる直前の所定時間内における当該第２通電電流の近似直線Ｌ３２と電流値０の軸とが交差する第２交点Ｐ３２と、を算出する。そして、状態判断部１２４は、先頭燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ１）から第１交点Ｐ３０までの時間（Δｔ３−１）に対し、後続燃料噴射における燃料噴射弁１０４への通電開始（時刻ｔ５）から、対応する第２通電電流の第２交点Ｐ３２までの時間（Δｔ３−２）が、第３所定時間（Δｔｔｈ３）以上短いとき、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていなかったものと判断する。 That is, in the coordinate plane composed of the time and the current value, the state determination unit 124 has the approximate straight line L30 of the first energizing current and the axis of the current value 0 within a predetermined time immediately before the first energizing current becomes maximum. Calculates the first intersection P30 where do. Then, the state determination unit 124 sends the fuel injection valve 104 to the fuel injection valve 104 in the subsequent fuel injection with respect to the time (Δt 3-1 ) from the start of energization of the fuel injection valve 104 in the first fuel injection to the first intersection P30 (time t1). When the time (Δt 3-2 ) from the start of energization (time t5) to the second intersection P32 of the corresponding second energization current is shorter than the third predetermined time (Δt th3 ), the fuel is fueled immediately before the subsequent fuel injection. It is determined that the injection valve 104 is not in the fully closed state.

次に、燃料噴射制御装置１００の状態判断部１２４における処理の手順について、図４に示すフロー図に従って説明する。本処理は、燃料噴射制御装置１００の電源がオンされた後、通電制御部１２２による燃料噴射弁１０４への駆動電圧の制御が開始されたときに開始する。また、本処理は、例えば燃料噴射制御装置１００の電源がオフされたことにより通電制御部１２２による燃料噴射弁１０４への駆動電圧の制御が終了したときに終了する。 Next, the processing procedure in the state determination unit 124 of the fuel injection control device 100 will be described with reference to the flow chart shown in FIG. This process starts when the power supply of the fuel injection control device 100 is turned on and then the control of the drive voltage to the fuel injection valve 104 by the energization control unit 122 is started. Further, this process ends when the control of the drive voltage to the fuel injection valve 104 by the energization control unit 122 is completed due to, for example, the power supply of the fuel injection control device 100 being turned off.

処理を開始すると、状態判断部１２４は、内燃機関１０２の燃焼サイクルにおける燃料噴射期間が開始したか否かを判断する（Ｓ１００）。この判断は、状態判断部１２４が、例えば、クランク角センサ１０６からの信号又は通電制御部１２２の動作状態に基づいて行うことができる。 When the process is started, the state determination unit 124 determines whether or not the fuel injection period in the combustion cycle of the internal combustion engine 102 has started (S100). This determination can be made by the state determination unit 124 based on, for example, a signal from the crank angle sensor 106 or an operating state of the energization control unit 122.

そして、状態判断部１２４は、燃料噴射期間が開始していないときは（Ｓ１００、ＮＯ）、ステップＳ１００に戻って燃料噴射期間が開始するのを待機し、燃料噴射期間が開始したときは（Ｓ１００、ＹＥＳ）、電流波形検出部１３０により、燃料噴射期間中における燃料噴射弁１０４へのＩＮＪ電流を、所定の時間間隔で検出して、記憶部１１８に保存する（Ｓ１０２）。 Then, when the fuel injection period has not started (S100, NO), the state determination unit 124 returns to step S100 and waits for the fuel injection period to start, and when the fuel injection period starts (S100). , YES), the current waveform detection unit 130 detects the INJ current to the fuel injection valve 104 during the fuel injection period at predetermined time intervals and stores it in the storage unit 118 (S102).

続いて、状態判断部１２４は、燃料噴射制御装置１００の製造時等において記憶部１１８に予め記憶された比較モード指示値を参照し、比較モード指示値が１であるか否かを判断する（Ｓ１０４）。そして、比較モード指示値が１であれば（Ｓ１０４、ＹＥＳ）、状態判断部１２４は、上述した第１のパラメータを用いて第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検出する。すなわち、状態判断部１２４は、速度変化点比較部１４０により、先頭燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ１から第１通電電流の増加速度の変化時刻ｔ２までの時間Δｔ１−１と、後続燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ５から、第２通電電流の増加速度の変化時刻ｔ９までの時間Δｔ１−２とを算出する。そして、速度変化点比較部１４０は、Δｔ１−１−Δｔ１−２≧Δｔｔｈ１であるか否かを判断する（Ｓ１０６）。 Subsequently, the state determination unit 124 refers to the comparison mode instruction value stored in advance in the storage unit 118 at the time of manufacturing the fuel injection control device 100 or the like, and determines whether or not the comparison mode instruction value is 1. S104). Then, if the comparison mode indicated value is 1 (S104, YES), the state determination unit 124 uses the above-mentioned first parameter to determine the time change curve of the second energization current with respect to the time change curve of the first energization current. Detect the presence or absence of deviation. That is, the state determination unit 124 uses the speed change point comparison unit 140 to set the time Δt 1-1 from the energization start time t1 to the fuel injection valve 104 in the leading fuel injection to the change time t2 of the increase rate of the first energization current. , The time Δt 1-2 from the energization start time t5 to the fuel injection valve 104 in the subsequent fuel injection to the change time t9 of the increase rate of the second energization current is calculated. Then, the velocity change point comparison unit 140 determines whether or not Δt 1-1 − Δt 1-2 ≧ Δt th1 (S106).

ステップＳ１０６において、Δｔ１−１−Δｔ１−２≧Δｔｔｈ１であれば（Ｓ１０６、ＹＥＳ）、状態判断部１２４は、対応する後続燃料噴射の直前において燃料噴射弁１０４は全閉弁状態になっていなかったものと判断し、異常動作が発生した旨を、例えば通信Ｉ／Ｆ部１１６を介して、動作管理を行う管理装置（不図示）へ通知する（Ｓ１０８）。 In step S106, if Δt 1-1 − Δt 1-2 ≧ Δt th1 (S106, YES), the state determination unit 124 puts the fuel injection valve 104 in a fully closed state immediately before the corresponding subsequent fuel injection. It is determined that the operation has not been performed, and the fact that an abnormal operation has occurred is notified to the management device (not shown) that manages the operation via, for example, the communication I / F unit 116 (S108).

一方、ステップＳ１０６において、Δｔ１−１−Δｔ１−２≧Δｔｔｈ１でないときは（Ｓ１０６、ＮＯ）、状態判断部１２４は、対応する後続燃料噴射の直前において燃料噴射弁１０４は全閉弁状態になっていたものと判断し、正常動作であった旨を、管理装置へ通知する（Ｓ１１０）。なお、管理装置は、燃料噴射制御装置１００からの正常動作又は異常動作についての上記通知を記憶して、メンテナンス時に当該通知についての情報を作業者に提供したり、所定のエラー処理を行うものとすることができる。 On the other hand, in step S106, when Δt 1-1 − Δt 1-2 ≧ Δt th1 (S106, NO), the state determination unit 124 indicates that the fuel injection valve 104 is in a fully closed state immediately before the corresponding subsequent fuel injection. It is determined that the fuel has been changed to, and the management device is notified that the operation was normal (S110). The management device stores the above notification of normal operation or abnormal operation from the fuel injection control device 100, provides information about the notification to the operator at the time of maintenance, and performs predetermined error processing. can do.

一方、ステップＳ１０４において比較モード指示値が１でないときは（Ｓ１０４、ＮＯ）、状態判断部１２４は、比較モード指示値が２であるか否かを判断する（Ｓ１１２）。そして、比較モード指示値が２であれば（Ｓ１１２、ＹＥＳ）、状態判断部１２４は、上述した第２のパラメータを用いて第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検出する。すなわち、状態判断部１２４は、最大電流比較部１４２により、第１通電電流の最大値Ｉｍａｘ−１と、第２通電電流の最大値Ｉｍａｘ−２とを算出し、Ｉｍａｘ−２−Ｉｍａｘ−１≧Ｉｔｈであるか否かを判断する（Ｓ１１４）。 On the other hand, when the comparison mode indicated value is not 1 in step S104 (S104, NO), the state determination unit 124 determines whether or not the comparison mode indicated value is 2 (S112). Then, if the comparison mode indicated value is 2 (S112, YES), the state determination unit 124 uses the above-mentioned second parameter to determine the time change curve of the second energization current with respect to the time change curve of the first energization current. Detect the presence or absence of deviation. That is, the state determination unit 124 calculates the maximum value I max-1 of the first energization current and the maximum value I max-2 of the second energization current by the maximum current comparison unit 142, and I max-2- I. It is determined whether or not max-1 ≧ Is (S114).

そして、状態判断部１２４は、Ｉｍａｘ−２−Ｉｍａｘ−１≧Ｉｔｈであれば（Ｓ１１４、ＹＥＳ）、ステップＳ１０８に処理を移して異常動作が発生した旨を通知し、Ｉｍａｘ−２−Ｉｍａｘ−１≧Ｉｔｈでないときは（Ｓ１１４、ＮＯ）、ステップＳ１１０に処理を移して正常動作であった旨を通知する。 Then, the state determining unit 124 notifies the if I max-2 -I max-1 ≧ I th (S114, YES), that the abnormal operation is transferred to step S108 occurs, I max-2 If not -I max-1 ≧ I th is notifying (S114, nO), it was normal operation the process proceeds to step S110.

一方、ステップＳ１１２において比較モード指示値が２でないときは（Ｓ１１２、ＮＯ）、状態判断部１２４は、比較モード指示値が３であるか否かを判断する（Ｓ１１６）。そして、比較モード指示値が３であれば（Ｓ１１６、ＹＥＳ）、状態判断部１２４は、上述した第３のパラメータを用いて第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検出する。すなわち、状態判断部１２４は、到達時間比較部１４４により、先頭燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ１から第１通電電流が第２所定値Ｉｐに達するまでの時間Δｔ２−１と、後続燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ５から、対応する第２通電電流が第２所定値Ｉｐに達するまでの時間Δｔ２−２とを算出し、Δｔ２−２−Δｔ２−１≧Δｔｔｈ２であるか否かを判断する（Ｓ１１８）。 On the other hand, when the comparison mode indicated value is not 2 in step S112 (S112, NO), the state determination unit 124 determines whether or not the comparison mode indicated value is 3 (S116). Then, if the comparison mode indicated value is 3 (S116, YES), the state determination unit 124 uses the above-mentioned third parameter to determine the time change curve of the second energization current with respect to the time change curve of the first energization current. Detect the presence or absence of deviation. That is, in the state determination unit 124, the arrival time comparison unit 144 sets the time Δt 2-1 from the start time t1 of energization to the fuel injection valve 104 in the leading fuel injection until the first energization current reaches the second predetermined value Ip. From the energization start time t5 to the fuel injection valve 104 in the subsequent fuel injection, the time Δt 2-2 until the corresponding second energization current reaches the second predetermined value Ip is calculated, and Δt 2-2- Δt 2 It is determined whether or not -1 ≧ Δt th2 (S118).

そして、状態判断部１２４は、Δｔ２−２−Δｔ２−１≧Δｔｔｈ２であるときは（Ｓ１１８、ＹＥＳ）、ステップＳ１０８に処理を移して異常動作が発生した旨を通知し、Δｔ２−２−Δｔ２−１≧Δｔｔｈ２でないときは（Ｓ１１８、ＮＯ）、ステップＳ１１０に処理を移して正常動作であった旨を通知する。 Then, when Δt 2-2- Δt 2-1 ≧ Δt th2 (S118, YES), the state determination unit 124 shifts the process to step S108 to notify that an abnormal operation has occurred, and Δt 2-. When 2- Δt 2-1 ≧ Δt th2 (S118, NO), the process is transferred to step S110 to notify that the normal operation has been performed.

一方、ステップＳ１１２６おいて比較モード指示値が３でないときは（Ｓ１１６、ＮＯ）、状態判断部１２４は、比較モード指示値が４であったものと判断し、上述した第４のパラメータを用いて第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を検出する。すなわち、状態判断部１２４は、外挿点比較部１４６により、第１通電電流が最大となる直前の所定時間内における第１通電電流の近似直線Ｌ３０と電流値０の軸とが交差する第１交点Ｐ３０と、第２通電電流が最大となる直前の所定時間内における当該第２通電電流の近似直線Ｌ３２と電流値０の軸とが交差する第２交点Ｐ３２と、を算出する。また、外挿点比較部１４６は、先頭燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ１から第１交点Ｐ３０までの時間Δｔ３−１と、後続燃料噴射における燃料噴射弁１０４への通電開始時刻ｔ５から対応する第２通電電流の第２交点Ｐ３２までの時間Δｔ３−２とを算出し、Δｔ３−２−Δｔ３−１≧Δｔｔｈ３であるか否かを判断する（Ｓ１２０）。 On the other hand, when the comparison mode indicated value is not 3 in step S1126 (S116, NO), the state determination unit 124 determines that the comparison mode indicated value was 4, and uses the fourth parameter described above. The presence or absence of deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current is detected. That is, in the state determination unit 124, the external point comparison unit 146 allows the first current to intersect the axis of the current value 0 with the approximate straight line L30 of the first current within a predetermined time immediately before the first current is maximized. The intersection P30 and the second intersection P32 where the approximate straight line L32 of the second energizing current and the axis of the current value 0 intersect within a predetermined time immediately before the maximum second energizing current is calculated. Further, the external point comparison unit 146 starts energizing the fuel injection valve 104 in the subsequent fuel injection with the time Δt 3-1 from the energization start time t1 to the first intersection P30 in the leading fuel injection. The time Δt 3-2 from the time t5 to the second intersection P32 of the corresponding second energizing current is calculated, and it is determined whether or not Δt 3-2 −Δt 3-1 ≧ Δt th3 (S120).

そして、状態判断部１２４は、Δｔ３−２−Δｔ３−１≧Δｔｔｈ３であるときは（Ｓ１２０、ＹＥＳ）、ステップＳ１０８に処理を移して異常動作が発生した旨を通知し、Δｔ３−２−Δｔ３−１≧Δｔｔｈ３でないときは（Ｓ１２０、ＮＯ）、ステップＳ１１０に処理を移して正常動作であった旨を通知する。 Then, when Δt 3-2- Δt 3-1 ≧ Δt th3 (S120, YES), the state determination unit 124 shifts the process to step S108 to notify that an abnormal operation has occurred, and Δt 3-. When 2- Δt 3-1 ≧ Δt th3 (S120, NO), the process is transferred to step S110 to notify that the normal operation has been performed.

また、状態判断部１２４は、ステップＳ１０８又はＳ１１０において対応する通知を行った後は、ステップＳ１００に戻って処理を繰り返す。 Further, after the state determination unit 124 gives the corresponding notification in step S108 or S110, the state determination unit 124 returns to step S100 and repeats the process.

以上、説明したように、本実施形態の燃料噴射制御装置１００は、燃料噴射弁１０４を直接的に制御して多段噴射動作を行う際に、先頭燃料噴射における燃料噴射弁１０４へのＩＮＪ電流（第１通電電流）の時間変化曲線に対する、後続燃料噴射おけるＩＮＪ電流（第２通電電流）の時間変化曲線の偏差から、後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていたか否かを判断する。 As described above, in the fuel injection control device 100 of the present embodiment, when the fuel injection valve 104 is directly controlled to perform the multi-stage injection operation, the INJ current (INJ current) to the fuel injection valve 104 in the leading fuel injection is applied. From the deviation of the INJ current (second energization current) time change curve in the subsequent fuel injection with respect to the time change curve of the first energization current), was the fuel injection valve 104 fully closed immediately before the subsequent fuel injection? Judge whether or not.

従って、燃料噴射制御装置１００では、燃料噴射弁１０４を直接的に制御することから電磁スピル弁を備えた燃料加圧室を設ける必要がなく、且つ、従来技術のように後続燃料噴射におけるＩＮＪ電流についてのピーク値や上昇速度についての閾値を、燃料噴射弁１０４毎に又は内燃機関１０２毎に設定する必要がない。このため、燃料噴射制御装置１００では、燃料噴射弁を直接的に制御して多段噴射を行う内燃機関において、当該多段噴射の際の噴射動作間における燃料噴射弁の全閉状態の確立の有無を安価且つ効果的に検知することができる。 Therefore, in the fuel injection control device 100, since the fuel injection valve 104 is directly controlled, it is not necessary to provide a fuel pressurizing chamber provided with an electromagnetic spill valve, and the INJ current in the subsequent fuel injection as in the prior art. It is not necessary to set the peak value and the threshold value for the ascending speed for each fuel injection valve 104 or each internal combustion engine 102. Therefore, in the fuel injection control device 100, in an internal combustion engine that directly controls the fuel injection valve to perform multi-stage injection, whether or not the fuel injection valve is fully closed during the injection operation during the multi-stage injection is established. It can be detected inexpensively and effectively.

なお、上述した実施形態においては、先頭燃料噴射の後に１回の後続燃料噴射が行われるものとしたが、これには限られない。先頭燃料噴射の後に、複数回の後続燃料噴射が行われるものとしてもよい。この場合には、燃料噴射制御装置１００は、状態判断部１２４により、先頭燃料噴射における第１通電電流の時間変化曲線に対する、少なくとも１回の後続燃料噴射における第２通電電流の時間変化曲線の偏差から、当該少なくとも１回の後続燃料噴射の直前において燃料噴射弁１０４が全閉弁状態となっていたか否かを判断するものとすることができる。 In the above-described embodiment, one subsequent fuel injection is performed after the first fuel injection, but the present invention is not limited to this. After the first fuel injection, a plurality of subsequent fuel injections may be performed. In this case, the fuel injection control device 100 uses the state determination unit 124 to deviate from the time change curve of the first energization current in the first fuel injection with respect to the time change curve of the second energization current in at least one subsequent fuel injection. Therefore, it can be determined whether or not the fuel injection valve 104 is in the fully closed state immediately before the at least one subsequent fuel injection.

また、上述した実施形態においては、燃料噴射制御装置１００の製造時等において予め記憶部１１８に記憶された比較モード指示値に従って、上述した４つのパラメータのいずれかを用いて第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を判断するものとしたが、これには限られない。例えば、燃料噴射制御装置１００は、上記４つのパラメータのうちの複数のパラメータを用いて、当該複数のパラメータのいずれか又は全てについて、上述した条件が満たされたときに、第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差が生じているものと判断してもよい。 Further, in the above-described embodiment, the time of the first energizing current is used by using any of the above-mentioned four parameters according to the comparison mode indicated value stored in advance in the storage unit 118 at the time of manufacturing the fuel injection control device 100 or the like. It is determined whether or not there is a deviation of the time change curve of the second energizing current with respect to the change curve, but the present invention is not limited to this. For example, the fuel injection control device 100 uses a plurality of parameters among the above four parameters, and when any or all of the plurality of parameters satisfy the above-mentioned conditions, the time of the first energizing current. It may be determined that the deviation of the time change curve of the second energizing current with respect to the change curve has occurred.

あるいは、燃料噴射制御装置１００は、速度変化点比較部１４０、最大電流比較部１４２、到達時間比較部１４４、及び外挿点比較部１４６のいずれか一つ又は複数を備えるものとし、当該一つ又は複数の比較部の動作に対応する一つ又は複数のパラメータを用いて、第１通電電流の時間変化曲線に対する第２通電電流の時間変化曲線の偏差の有無を判断するものとしてもよい。 Alternatively, the fuel injection control device 100 shall include any one or more of the speed change point comparison unit 140, the maximum current comparison unit 142, the arrival time comparison unit 144, and the extrapolation point comparison unit 146. Alternatively, it may be determined whether or not there is a deviation of the time change curve of the second energization current with respect to the time change curve of the first energization current by using one or a plurality of parameters corresponding to the operation of the plurality of comparison units.

また、上述した実施形態においては、燃料噴射弁１０４を開弁する際に、まず昇圧電圧ＶＵを印加した後、電圧ＶＢを印加するものとしたが、これには限られない。燃料噴射弁１０４を開弁することのできる限りにおいて、且つ、先頭燃料噴射と後続燃料噴射において燃料噴射弁１０４に同じ波形の電圧が印加される限りにおいて、燃料噴射弁１０４への印加電圧は、例えば、固定の連続電圧又はパルス電圧とすることができる。 Further, in the above-described embodiment, when the fuel injection valve 104 is opened, the boost voltage V U is first applied, and then the voltage V B is applied, but the present invention is not limited to this. As long as the fuel injection valve 104 can be opened, and as long as a voltage having the same waveform is applied to the fuel injection valve 104 in the first fuel injection and the subsequent fuel injection, the applied voltage to the fuel injection valve 104 is. For example, it can be a fixed continuous voltage or a pulsed voltage.

１００…燃料噴射制御装置、１０２…内燃機関、１０４…燃料噴射弁、１０６…クランク角センサ、１０８…アクセルセンサ、１１０…昇圧回路、１１２…駆動電圧出力部、１１４…電流検出部、１１６…通信インタフェース（Ｉ／Ｆ）部、１１８…記憶部、１２０…処理装置、１２２…通電制御部、１２４…状態判断部、１３０…電流波形検出部、１３２…波形比較部、１４０…速度変化点比較部、１４２…最大電流比較部、１４４…到達時間比較部、１４６…外挿点比較部。
100 ... Fuel injection control device, 102 ... Internal engine, 104 ... Fuel injection valve, 106 ... Crank angle sensor, 108 ... Accelerator sensor, 110 ... Boost circuit, 112 ... Drive voltage output unit, 114 ... Current detection unit, 116 ... Communication Interface (I / F) unit, 118 ... storage unit, 120 ... processing device, 122 ... energization control unit, 124 ... state determination unit, 130 ... current waveform detection unit, 132 ... waveform comparison unit, 140 ... speed change point comparison unit , 142 ... Maximum current comparison unit, 144 ... Arrival time comparison unit, 146 ... External point comparison unit.

Claims (5)

内燃機関の気筒に設けられた燃料噴射弁により前記気筒への燃料噴射期間に前記気筒へ複数回の燃料噴射を行う多段噴射動作を制御する燃料噴射制御装置であって、
前記燃料噴射弁への通電電流を検出する電流検出部と、
前記燃料噴射弁に流れる通電電流から前記燃料噴射弁の開閉動作の状態を判定する状態判断部と、
を備え、
前記状態判断部は、
前記燃料噴射期間における前記複数回の燃料噴射のうち、１回目の前記燃料噴射である先頭燃料噴射と、前記先頭燃料噴射の後に行われる燃料噴射である少なくとも１回の後続燃料噴射とにおいて、前記先頭燃料噴射における前記通電電流である第１通電電流と、前記後続燃料噴射おける前記通電電流である第２通電電流と、を検出し、
前記第１通電電流の時間変化曲線に対する、前記第２通電電流の時間変化曲線の偏差から、前記後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていたか否かを判断する、
よう構成されている、
燃料噴射制御装置。 A fuel injection control device that controls a multi-stage injection operation in which a fuel injection valve provided in a cylinder of an internal combustion engine controls a multi-stage injection operation in which fuel is injected into the cylinder a plurality of times during the fuel injection period into the cylinder.
A current detection unit that detects the energizing current to the fuel injection valve, and
A state determination unit that determines the state of opening / closing operation of the fuel injection valve from the energizing current flowing through the fuel injection valve.
With
The state determination unit
Of the plurality of fuel injections during the fuel injection period, the first fuel injection, which is the first fuel injection, and at least one subsequent fuel injection, which is a fuel injection performed after the first fuel injection, are described. The first energizing current, which is the energizing current in the first fuel injection, and the second energizing current, which is the energizing current in the subsequent fuel injection, are detected.
From the deviation of the time change curve of the second energizing current with respect to the time change curve of the first energizing current, it is determined whether or not the fuel injection valve is in the fully closed state immediately before the subsequent fuel injection.
Is configured to
Fuel injection control device. 前記状態判断部は、前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１通電電流の増加速度の変化時刻までの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流の増加速度の変化時刻までの時間が、第１所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する、
請求項１に記載の燃料噴射制御装置。 The state determination unit starts energization of the fuel injection valve in the subsequent fuel injection with respect to the time from the start of energization of the fuel injection valve in the first fuel injection to the change time of the increase rate of the first energization current. When the time from the change time to the change time of the corresponding increase rate of the second energizing current is shorter than the first predetermined time, the fuel injection valve is not in the fully closed state immediately before the subsequent fuel injection. To judge,
The fuel injection control device according to claim 1. 前記状態判断部は、前記第１通電電流の最大値に対し、前記第２通電電流の最大値が第１所定値以上大きいとき、当該第２通電電流に対応する前記後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する、
請求項１又は２に記載の燃料噴射制御装置。 When the maximum value of the second energizing current is larger than the first predetermined value with respect to the maximum value of the first energizing current, the state determination unit said that immediately before the subsequent fuel injection corresponding to the second energizing current. Judging that the fuel injection valve was not fully closed,
The fuel injection control device according to claim 1 or 2. 前記状態判断部は、前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１通電電流が第２所定値に達するまでの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流が前記第２所定値に達するまでの時間が第２所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する、
請求項１ないし３のいずれか一項に記載の燃料噴射制御装置。 The state determination unit energizes the fuel injection valve in the subsequent fuel injection with respect to the time from the start of energization of the fuel injection valve in the head fuel injection until the first energization current reaches the second predetermined value. When the time from the start until the corresponding second energizing current reaches the second predetermined value is shorter than the second predetermined time, the fuel injection valve is not fully closed immediately before the subsequent fuel injection. Judging that it was
The fuel injection control device according to any one of claims 1 to 3. 前記状態判断部は、
時間と電流値とで構成される座標平面において、前記第１通電電流が最大となる直前の所定時間内における当該第１通電電流の近似直線と電流値０の軸とが交差する第１交点と、前記第２通電電流が最大となる直前の所定時間内における当該第２通電電流の近似直線と電流値０の軸とが交差する第２交点と、を算出し、
前記先頭燃料噴射における前記燃料噴射弁への通電開始から前記第１交点までの時間に対し、前記後続燃料噴射における前記燃料噴射弁への通電開始から、対応する前記第２通電電流の前記第２交点までの時間が、第３所定時間以上短いとき、当該後続燃料噴射の直前において前記燃料噴射弁が全閉弁状態となっていなかったものと判断する、
請求項１ないし４のいずれか一項に記載の燃料噴射制御装置。
The state determination unit
In the coordinate plane composed of time and current value, the first intersection where the approximate straight line of the first energizing current and the axis of current value 0 intersect within a predetermined time immediately before the first energizing current becomes maximum. , The second intersection where the approximate straight line of the second energizing current and the axis of the current value 0 intersect within a predetermined time immediately before the second energizing current becomes maximum is calculated.
With respect to the time from the start of energization of the fuel injection valve to the first intersection in the leading fuel injection, the second energization current of the second energization current corresponding to the time from the start of energization of the fuel injection valve in the subsequent fuel injection. When the time to the intersection is shorter than the third predetermined time, it is determined that the fuel injection valve was not fully closed immediately before the subsequent fuel injection.
The fuel injection control device according to any one of claims 1 to 4.
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